People have been naming inanimate objects since before written history. It's done for fun. If you don't want to name your van, don't worry about it.
I named vehicles as inspiration hits. Some names come quickly, some take a few years. I didn't name my 94 Astro for 5 years, then I bought my 2000 Astro, they became Red and Blue respectively. Blue was totaled and replaced with Green. Grumpy was purchased with body damage that made me think it was scowling and thus got it's name. Names also come in handy when you have multiples of the same vehicle. If I said something was in the van, the reply would be "which one". Using the names gets thing done quicker.